Prepare release 3.0.13

Author: XWB

CHANGELOG-3.0.md

@@ -12,9 +12,10 @@ https://github.com/FriendsOfSymfony/FOSElasticaBundle/compare/v3.0.0...v3.0.1
 To generate a changelog summary since the last version, run
 `git log --no-merges --oneline v3.0.0...3.0.x`
 
-* 3.0.13 (2015-xx-xx)
+* 3.0.13 (2015-09-17)
 
  * Add PHP 7 compatibility
+ * Fix: Don't use parent identifier for objects/nested documents
 
 * 3.0.12 (2015-08-31)